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Christchurch's piped tapwater is now safe to drink, but the city's residents have been urged to boil all drinking water from other sources.

Canterbury Medical Officer of Health Ramon Pink today informed the Christchurch City Council that it was safe to drink water from the city's pipes and lifted the boil water notice put in place following last week's 5.7 and 6.3 magnitude aftershocks.

"The testing of the water supply across the city has meant that we are confident Christchurch's tap water is now safe to drink," Dr Pink said.

Water from other sources should still be boiled, Dr Pink said.

"We advise people still sourcing water from private bores and wells, tankers, emergency tanks or distribution points to continue to boil the water."